expense/app/Models/Notifications.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Notifications extends Model
{
    protected $table = 'notifications';
    protected $fillable = [
        'user_id',
        'receiver_id',
        'title',
        'content',
        'is_read',
        'type',
        'expense_type',
        'expense_id',
        'created_at',
        'updated_at'
    ];
}